public static bool Exist(IPeriod period, IEnumerable <IPeriod> periods, DateComparison dateComparison)
{
return(periods.Any(p => p != period && p.StartDate.CompareTo(period.StartDate) == (int)dateComparison));
}
public static bool DoesSpeakerHaveOtherSessions(Speaker speaker, Session currentSession, DateComparison when)
{
return(speaker.Sessions.Any(
s => s.Id != currentSession.Id &&
s.ScheduledAt.CompareTo(currentSession.ScheduledAt) == (int)when
));
}
